JEE PHYSICS UNIT 13
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The SI unit of magnetic field strength is
A. Tesla
B. Weber
C. Gauss
D. Henry
2. The force experienced by a charged particle moving in a magnetic field is maximum when the angle between velocity and magnetic field is
A. 0°
B. 45°
C. 90°
D. 180°
3. According to Fleming's Left-Hand Rule, the thumb represents
A. Direction of current
B. Direction of magnetic field
C. Direction of force
D. None of the above
4. The magnetic field inside a long, straight solenoid carrying current is
A. Zero
B. Non-uniform
C. Uniform
D. Depends on the material of the solenoid
5. A current-carrying conductor placed in a magnetic field experiences a force. This phenomenon is utilized in
A. Electric generators
B. Electric motors
C. Transformers
D. Capacitors
6. The device used to measure the strength of a magnetic field is
A. Voltmeter
B. Ammeter
C. Magnetometer
D. Galvanometer
7. The magnetic field at the center of a circular loop carrying current is
A. Directly proportional to the radius of the loop
B. Inversely proportional to the radius of the loop
C. Independent of the radius of the loop
D. Zero
8. The phenomenon of electromagnetic induction was discovered by
A. Oersted
B. Faraday
C. Ampere
D. Maxwell
9. Lenz's Law is a consequence of the law of conservation of
A. Energy
B. Charge
C. Momentum
D. Mass
10. The unit of magnetic flux is
A. Tesla
B. Weber
C. Henry
D. Farad
11. The torque τ experienced by a magnetic dipole of moment M in a uniform magnetic field B is given by
A. τ = M × B
B. τ = M + B
C. τ = M/B
D. τ = MB
12. The magnetic susceptibility χ of a diamagnetic material is
A. Positive and small
B. Negative and small
C. Positive and large
D. Negative and large
13. The area enclosed by a hysteresis loop represents
A. Permeability
B. Retentivity
C. Coercivity
D. Energy loss per cycle
14. The direction of induced current in a closed loop is given by
A. Faraday's Law
B. Lenz's Law
C. Ampere's Law
D. Biot-Savart Law
15. The magnetic field due to a current-carrying infinite straight wire at a perpendicular distance r is proportional to
A. r
B. 1/r
C. r²
D. 1/r²
16. The force between two parallel current-carrying conductors is used to define
A. Ampere
B. Volt
C. Ohm
D. Coulomb
17. A moving coil galvanometer can be converted into an ammeter by connecting
A. A high resistance in series
B. A low resistance in series
C. A high resistance in parallel
D. A low resistance in parallel
18. The Earth's magnetic field is approximately
A. 1 Tesla
B. 1 Gauss
C. 0.5 Tesla
D. 0.5 Gauss
19. The phenomenon where a change in magnetic field induces an electromotive force (emf) is called
A. Electrolysis
B. Electromagnetic induction
C. Photoelectric effect
D. Thermoelectric effect
20. The magnetic moment of a current loop is proportional to
A. Current
B. Area of the loop
C. Number of turns
D. All of the above
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